Keycloak vs OATH (Open Authentication): Side-by-Side Comparison (2026)

Keycloak: Open-source IAM solution for SSO, MFA, and identity federation. built by keycloak. Core capabilities include Single sign-on (SSO), Multi-factor authentication with passkeys and recovery codes, Identity federation with external providers..

OATH (Open Authentication): Vendor-neutral org publishing open standards for OTP & strong auth. built by OATH (Open Authentication). Core capabilities include Open, royalty-free OTP specifications (HOTP, TOTP, OCRA), HOTP (RFC 4226): counter-based HMAC one-time password standard, TOTP (RFC 6238): time-based one-time password standard..

Both serve the Multi-Factor Authentication and Single Sign-On market but differ in approach, feature depth, and target audience.

Keycloak differentiates with Single sign-on (SSO), Multi-factor authentication with passkeys and recovery codes, Identity federation with external providers. OATH (Open Authentication) differentiates with Open, royalty-free OTP specifications (HOTP, TOTP, OCRA), HOTP (RFC 4226): counter-based HMAC one-time password standard, TOTP (RFC 6238): time-based one-time password standard.

Keycloak is developed by keycloak. OATH (Open Authentication) is developed by OATH (Open Authentication). Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Keycloak and OATH (Open Authentication) serve similar Multi-Factor Authentication and Single Sign-On use cases: both are Multi-Factor Authentication and Single Sign-On tools, both cover Authentication, MFA, Open Source. Key differences: Keycloak is Commercial while OATH (Open Authentication) is Free. Review the feature comparison above to determine which fits your requirements.